Looks like Jessica Simpson could be attending her sister's wedding alone this weekend.

The singer and her Dallas Cowboys quarterback beau Tony Romo have reportedly split, sources told the Dallas Morning News.

Despite rep denials, "two people close to Tony and Jess have told me that the glam couple is splitsville, kaput, over, put a fork in it," columnist Alan Peppard wrote.

The new issue of Us Weekly reports that over the weekend, Romo partied at Chicago club Manor with a bevy of blondes and announced to pals: "We are broken up."

Click here for pictures of Lindsay — the one particular beauty Romo, 28, cozied up to.

(To add insult to injury: Simpson had so much to drink the day ex John Mayer's public debut with Jennifer Aniston that she had to call her mom for a ride home from a L.A. Mexican restaurant, Us reports in its latest issue.)

A rep for the pair insisted to Us earlier this week that the singer is "very happy with Tony…they are both happy together."

But when the Morning News caught up with Romo at the Cowboys Golf Club in Grapevine, Texas, he fumed, "I'm not talking about Jessica."

Just last month Simpson was referring to Romo as her "future husband" and he was seen ring-shopping.